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Subject: [PATCH v7] virtio-net: support device stats
This patch allows the driver to obtain some statistics from the device. In the back-end implementation, we can count a lot of such information, which can be used for debugging and judging the running status of the back-end. We hope to directly display it to the user through ethtool. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- v7: 1. add rx_reset, tx_reset 2. add device normative and dirver normative 3. add comments for *_packets, *_bytres v6: 1. correct the names and descriptions of some stats items v5: 1. add VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ 2. more item for virtio_net_ctrl_reply_stats_queue_pair v4: 1. remove dev_stats_num, {rx|tx}_stats_num 2. Use two commands to get the stats of queue pair and dev respectively v3 changes: 1. add dev_version 2. use queue_pair_index replace rx_num, tx_num 3. Explain the processing when the device and driver support different numbers of stats content.tex | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 122 insertions(+), 1 deletion(-) diff --git a/content.tex b/content.tex index cf20570..f99d663 100644 --- a/content.tex +++ b/content.tex @@ -3092,6 +3092,9 @@ \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits \item[VIRTIO_NET_F_CTRL_MAC_ADDR(23)] Set MAC address through control channel. +\item[VIRTIO_NET_F_CTRL_STATS(55)] Device can provide device-level statistics + to the driver through the control channel. + \item[VIRTIO_NET_F_HOST_USO (56)] Device can receive USO packets. Unlike UFO (fragmenting the packet) the USO splits large UDP packet to several segments when each of these smaller packets has UDP header. @@ -3137,6 +3140,7 @@ \subsubsection{Feature bit requirements}\label{sec:Device Types / Network Device \item[VIRTIO_NET_F_GUEST_ANNOUNCE] Requires VIRTIO_NET_F_CTRL_VQ. \item[VIRTIO_NET_F_MQ] Requires VIRTIO_NET_F_CTRL_VQ. \item[VIRTIO_NET_F_CTRL_MAC_ADDR] Requires VIRTIO_NET_F_CTRL_VQ. +\item[VIRTIO_NET_F_CTRL_STATS] Requires VIRTIO_NET_F_CTRL_VQ. \item[VIRTIO_NET_F_RSC_EXT] Requires VIRTIO_NET_F_HOST_TSO4 or VIRTIO_NET_F_HOST_TSO6. \item[VIRTIO_NET_F_RSS] Requires VIRTIO_NET_F_CTRL_VQ. \end{description} @@ -4015,6 +4019,7 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi u8 command; u8 command-specific-data[]; u8 ack; + u8 command-specific-data-reply[]; }; /* ack values */ @@ -4023,7 +4028,8 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi \end{lstlisting} The \field{class}, \field{command} and command-specific-data are set by the -driver, and the device sets the \field{ack} byte. There is little it can +driver, and the device sets the \field{ack} byte and optionally +\field{command-specific-data-reply}. There is little it can do except issue a diagnostic if \field{ack} is not VIRTIO_NET_OK. @@ -4504,6 +4510,121 @@ \subsubsection{Legacy Interface: Framing Requirements}\label{sec:Device See \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Message Framing}. +\paragraph{Device stats}\label{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Device stats} + +If the VIRTIO_NET_F_CTRL_STATS feature is negotiated, the driver can +get device stats from the device by \field{command-specific-data-reply}. + +To get the stats, the following definitions are used: +\begin{lstlisting} +#define VIRTIO_NET_CTRL_STATS 6 +#define VIRTIO_NET_CTRL_STATS_GET_DEV 0 +#define VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ 1 +#define VIRTIO_NET_CTRL_STATS_GET_QUEUE_PAIR 2 +\end{lstlisting} + +The following layout structure are used: + +\field{command-specific-data} +\begin{lstlisting} +struct virtio_net_ctrl_stats_queue_pair { + le64 queue_pair_index; +} +\end{lstlisting} + +\field{command-specific-data-reply} +\begin{lstlisting} +struct virtio_net_ctrl_reply_stats_dev { + le64 dev_reset; // The number of device reset. +} + +struct virtio_net_ctrl_reply_stats_cvq { + le64 request_num; // The number of requests. + le64 ok_num; // The number of ok ack. + le64 err_num; // The number of err ack. + + le64 req_rx_promisc; // The number of requests with command VIRTIO_NET_CTRL_RX_PROMISC. + le64 req_rx_allmulti; // The number of requests with command VIRTIO_NET_CTRL_RX_ALLMULTI. + le64 req_rx_alluni; // The number of requests with command VIRTIO_NET_CTRL_RX_ALLUNI. + le64 req_rx_nomulti; // The number of requests with command VIRTIO_NET_CTRL_RX_NOMULTI. + le64 req_rx_nouni; // The number of requests with command VIRTIO_NET_CTRL_RX_NOUNI. + le64 req_rx_nobcast; // The number of requests with command VIRTIO_NET_CTRL_RX_NOBCAST. + le64 req_mac_table_set; // The number of requests with command VIRTIO_NET_CTRL_MAC_TABLE_SET. + le64 req_mac_addr_set; // The number of requests with command VIRTIO_NET_CTRL_MAC_ADDR_SET. + le64 req_vlan_add; // The number of requests with command VIRTIO_NET_CTRL_VLAN_ADD. + le64 req_vlan_del; // The number of requests with command VIRTIO_NET_CTRL_VLAN_DEL. + le64 req_announce_ack; // The number of requests with command VIRTIO_NET_CTRL_ANNOUNCE_ACK. + le64 req_mq_vq_pairs_set; // The number of requests with command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET. + le64 req_mq_rss_config; // The number of requests with command VIRTIO_NET_CTRL_MQ_RSS_CONFIG. + le64 req_mq_hash_config; // The number of requests with command VIRTIO_NET_CTRL_MQ_HASH_CONFIG. + le64 req_guest_offloads_set; // The number of requests with command VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET. +} + +struct virtio_net_ctrl_reply_stats_queue_pair { + /* rx stats */ + le64 rx_packets; // The number of packets recived by device, include the droped packets by device. + le64 rx_bytes; // The number of bytes recived by device, include the droped packets by device. + + le64 rx_notification; // The number of notifications from driver. + le64 rx_interrupt; // The number of interrupts generated by device. + + le64 rx_drop; // The number of packets dropped by the rx queue. Contains all kinds of packet drop. + le64 rx_drop_overruns; // The number of packets dropped by the rx queue when no more avail desc. + le64 rx_drop_oversize; // The number of oversized packets received by the rx queue. + + le64 rx_csum_valid; // The number of packets with VIRTIO_NET_HDR_F_DATA_VALID. + le64 rx_csum_partial; // The number of packets with VIRTIO_NET_HDR_F_NEEDS_CSUM. + le64 rx_csum_bad; // The number of packets with abnormal csum. + le64 rx_csum_none; // The number of packets without hardware csum. + + le64 rx_gso_packets; // The number of gso packets received by rx. + le64 rx_gso_bytes; // The number of gso bytes received by rx. + le64 rx_reset; // The number of queue resets. + + /* tx stats */ + le64 tx_packets; // The number of packets sent by device, excluding the droped packets by device. + le64 tx_bytes; // The number of bytes sent by device, excluding the droped packets by device. + + le64 tx_notification; // The number of notifications from driver. + le64 tx_interrupt; // The number of interrupts generated by device. + + le64 tx_drop; // The number of packets dropped by the tx queue. Contains all kinds of packet drop. + le64 tx_drop_desc_err; // The number of packets dropped when desc is error. + + le64 tx_csum_none; // The number of packets that doesn't require hardware csum. + le64 tx_csum_partial; // The number of packets that requires hardware csum. + + le64 tx_gso_packets; // The number of gso packets transmitted. + le64 tx_gso_bytes; // The number of gso bytes transmitted. + le64 tx_reset; // The number of queue resets. +} +\end{lstlisting} + +All device stats are divided into three categories: +\begin{itemize} + \item the stats of the device. (command: VIRTIO_NET_CTRL_STATS_GET_DEV) + \item the stats of the controlq. (command: VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ) + \item the stats of the queue pair. This contains the stats of rx and tx. + (command: VIRTIO_NET_CTRL_STATS_GET_QUEUE_PAIR) +\end{itemize} + +\devicenormative{\subparagraph}{Device stats}{Device Types / Network Device / Device Operation / Control Virtqueue / Device stats} +If VIRTIO_NET_F_CTRL_VQ is not negotiated, device MUST set the ack of +\field{virtio_net_ctrl} to VIRTIO_NET_ERR to reply VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ. + +If the requested queue_pair_index is out of range, device MUST set the ack of \field{virtio_net_ctrl} to VIRTIO_NET_ERR; + +\drivernormative{\subparagraph}{Device stats}{Device Types / Network Device / Device Operation / Control Virtqueue / Device stats} +When driver sends a VIRTIO_NET_CTRL_STATS_GET_DEV command, \field{command-specific-data} MUST be empty. +The structure \field{virtio_net_ctrl_reply_stats_dev} MUST be used for \field{command-specific-data-reply}. + +When driver sends a VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ command, \field{command-specific-data} MUST be empty. +The structure \field{virtio_net_ctrl_reply_stats_cvq} MUST be used for \field{command-specific-data-reply}. + +Driver sends a VIRTIO_NET_CTRL_STATS_GET_QUEUE_PAIR command using \field{virtio_net_ctrl_stats_queue_pair} for \field{command-specific-data}. +At the same time, the structure \field{virtio_net_ctrl_reply_stats_queue_pair} MUST be used for \field{command-specific-data-reply}. +\field{queue_pair_index} specify the queue pair index of the queue that the driver wants to get stats. + \section{Block Device}\label{sec:Device Types / Block Device} The virtio block device is a simple virtual block device (ie. -- 2.31.0
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